Piston-rod extension-guide.



P. J. COLE,

PISTON ROD EXTENSION GUIDE.

APPLICATION FILED JUNE 2, 'l.911

Patented Sept. 1

the piston rod, in at and guide, on the line a longitudinal central section. on an eu-i iJi iLTlilEE @TAlEhi PATENT FRANCIS 3'. COLE, OF SCHENECTADY, NEW YORK.

PISTON- ROD EXTENSIOIT-GUIDE.

Application filed June 2, 1911.

locomotive and other steam engines for preventing the piston head trom trailing; on the bottom of the cylinder, hy the provision of a support tor a torward extension of ldition to the rear sup port aiiorded by the main cross head.

Various terms of piston rod extension guides are known in practice, in some of which the extension of the piston rod. is unprovided with packing where it passes through the cylinder head and. works in a closed end pipe which is in open communication with the cylinder. In all prior eonstruetions, so tar as my knowledge and information extend, the objections obtain that the bottom of the rod becomes flattened, so that intime it ceases to be circular, making it ditticult to provide steam tight packing, and it is also impossihle to obtain sutticient bearing surface. owing; to the limited diameter of the extension rod. Frequent adjustments of the hearing are therefore necessitated. which are apt; to be overlooked in the ordinary round house locomotive inspection, and the prime object of the extension of the rod is defeated, allowed to trail on the bottom of the cylinder.

The object ot my invention is to provide means whereby the ahove recited objections may he obviated, by the employment of a carrying shoe and sel't centering guide by which alineinent is insured, and facilities for taking: up wear and maintaining the piston rod in normal central position in the cylinder.

T he improvement claimed is hereinafter "fully set forth.

In the acompanying drawing: Figure 1 is a longitudinal central section through the forward portion of a. steam engine cylinder, its head, and the piston rod guide, illustrating an application ot' my invention; Fig. 3 a. transverse section through the piston rod 4 a ot Fig. '1: Fig. 3.

latned scale. through the shoe, with the hear ng in elevation; and, Fig.1. 4:, a trans- Spcification of Letters Patent.

as the piston is then removal Patented inept. 1%, Mitt.

Serial No. 839.877.

verse section through the shoe and hearing, on the line b 7) of Fig. 5. it

My invention is herein exemplified as applied in connection with stcai'n engine oviindcr, 1. which is closed i l a head. l and titted with a piston, 2. secured upon a. piston rod, 2, having" a forard extension, :2, of smaller diameter,

which passes through the cylinder head, 1*,

a steam tight joint of the extension therew th being tor-med by a properly packed stuiimg hox, 3, ot any suitable and preferred construction. The head, 1'3. is turned to lit truly in the torward end of the cylinder, and is provided with a central hearing, i on its front side. which is turned concentrically with the portion of the head which tits in the cylii'ider, and is faced otlt' parailel with the. grinding face ot the tront cnd ot the cylinder. The rear end of the piston rod is secured to a cross head (not shown), in the usual manner.

A, guide, 4, which is open at its top, and is of substantially U or trough section, provided with a eircunrl srential flange. 49. at its rear end, which flange is l'mred and taced to tit truly on the periphery ot, and

against, the hearing. 1 of the front cylinder head, 1. As shown in Figs. 1 and 2, the flange, l does not enter completely around the cylinder head liicar ngr. 1', being open at, and downwardly from, its top, for a width greater than the diameter of the piston rod extension, so as to tiermit of the ot the guide without interference in the extension. The guide, l. secured to the head hy bolts, 4-, passing through the tlan re, 4, and is lcored out to segmental torn'i. Concentric with the cylinder. tor the major portion oi its length, that is, to a plane adjoining the shitting: box 2). The

guide is bored and its dance. 4*, turned and faced, atone setting, and it will therefore lJQ seen that, when secured to the. hearing of the cylinder head. it will he seit centering and true aXiall "with the cylinder. A. lip is formed on the outer end ot the guide, which is recessed helow its hore for a short distance trom the lip, to provide an oil ocltet. 4-". in which to niainta'l i a, levclot oil sliggjh'tlv aho've the hottom ot the bore of the guide. 1 similar oil pocket, 4;, i termed at toe rear end. oi the guide. the li oi said pocket twin made detachable, to permit unscrewing ot the smiling lion. gland,

. renewal of rings. etc.

at its front on d by.

Tilt) i The oiite rend portion of the extension, 2",

,of the piston rod, is tapered, and a shoe, 5, ,is secured on the tapered portionby a nut, 5". 'A bearing block, .6, which finished,

on its lower face, to a curvature corresponding with the segmental-bore of the guide, is

.secured detachably to the bottom of the.

shoe, 5, by bolts, 6?, and nuts, 6. By the insertion of liners of proper thickness be tween the shoe and bearing face, the'exten- Y sion of the piston rod may be brought back to normal central position when deviated therefrom by wear of the parts. i

i In order to prevent the access of dust-.to the bearing surfaces of the guide and shoe, the guide is closed at top by a cap plate, 7, which is secured detachably to it by bolts,

v 7 and which may be provided with a hinged rear section. To complete the inclosure of the bearing surfaces, the'forward end of the guide is closed by a plate, 8,

;iv.hich, in the instance illustrated, abuts against the rear side of a Wrought metal bum-per beam, 9. 'By reason of the bearing surface of the -"guide being curved concentricallylwith the common axis ofthe piston rod and cylin der, slight variations of the position of the vshoe in either direction are permissible,

without in an wise interferin with the correct and accurate alinement of the piston 'rod, and therefore no great degree of refinenent'in the transverse setting of the guide is essential. The facility of adjustment to compensate wear, by the insertion of liners between the shoe and its detachable bearing face is an advantage which will be recog-" nlzed as being of substantial practical value.

I claim'as my, invention and desire to secure by Letters Patent:

1.;In a steam engine, the-combination of [a cylinder, a head closing the frontend thereof, a piston fitting said'cylinder, a pishaving asegmental bearing face fitting the bearing'face of the guide.-

2. In, a" steam engine,the combination of a cylindena head closing the front end thereof, and. having a cylindrical bearing on its outer side concentric with the bore of the cylinder, a self centering guide sea forward extension passing through the.

head, and a shoe fixed to the extension and having a segmental bearing face fitting the bearing face of the guide. v

3. In a steam engine, theconibination of a cylinder, a head closing the front end thereof, and having a cylindrical bearing on its outer side concentric with the bore of the cylinder, an .open topped self centering guide having a segmental bearing face concentric with the boreof the cylinder, :1 circumferential flange on said guide fitting the periphery of, and secured'to, the cylinder head bearing, said flangc hafing an upper opening to clear a piston rod extension, a piston fitting the cylinder, a pislon'rod secured to said piston, and having a forward extension passing through the head, and a shoe fixed to the extension and having a segmental bearing face fitting the bearing face of the guide.

" 4. In a steam enginc.'the cou'lhiuatiou of a cylinder, a head closing the front end thereof. a piston fitting said cylinder. a piston rod secured to said piston and having a forward extension passing through the head, a. self centering guide secured to the head and having a segmental hearing face concentric with the cyliiuler, a shoe fixed to the extension of the piston rod, and a bearing block secured detachahly to the shoe and having a segmental lower face fit.- ting the bearing face of the guide. 5, Tu a steam engine, the combination of a cylinder, ahead closing the front end thereof, a pistonfitting said cylinder, :1 pistoured secured to said piston andluiviug a forward extension passing through the head,'an open topped self centering guide secured to the head and havinga scgn'icntal bearingafacc concentric with the cylinder, a shoe fixed to the extension of the piston. rod and having a segmental bearing face fitting the bearing face of the guide. and cover plates secured detachahly to the guide and closing the bearing face thereof against access of dust and other foreign mal'tdr.

FRANCIS J. COLE.

Witnesses FRANK F. Soovrnnn, S, W. Tynan.- 

